mirror of
https://github.com/chromium/crashpad.git
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6a6a0c27ed
Adds a new client API which allows causing an exception in another process. This is accomplished by injecting a thread that calls RaiseException(). A special exception code is used that indicates to the handler that the exception arguments contain a thread id and exception code, which are in turn used to fabricate an exception record. This is so that the API can allow the client to "blame" a particular thread in the target process. The target process must also be a registered Crashpad client, as the normal exception mechanism is used to handle the exception. The injection of a thread is used instead of DebugBreakProcess() which does not cause the UnhandledExceptionFilter() to be executed. NtCreateThreadEx() is used in lieu of CreateRemoteThread() as it allows passing of a flag which avoids calling DllMain()s. This is necessary to allow thread creation to succeed even when the target process is deadlocked on the loader lock. BUG=crashpad:103 Change-Id: I797007bd2b1e3416afe3f37a6566c0cdb259b106 Reviewed-on: https://chromium-review.googlesource.com/339263 Reviewed-by: Mark Mentovai <mark@chromium.org>
87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
// Copyright 2016 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdio.h>
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#include <windows.h>
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#include "base/debug/alias.h"
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#include "base/logging.h"
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#include "base/macros.h"
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#include "client/crashpad_client.h"
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#include "client/crashpad_info.h"
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DWORD WINAPI Thread1(LPVOID dummy) {
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Sleep(INFINITE);
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return 0;
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}
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DWORD WINAPI Thread2(LPVOID dummy) {
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Sleep(INFINITE);
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return 0;
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}
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DWORD WINAPI Thread3(LPVOID dummy) {
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HMODULE dll = LoadLibrary(L"loader_lock_dll.dll");
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if (!dll)
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PLOG(ERROR) << "LoadLibrary";
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// This call is not expected to return.
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if (!FreeLibrary(dll))
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PLOG(ERROR) << "FreeLibrary";
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return 0;
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}
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int wmain(int argc, wchar_t* argv[]) {
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crashpad::CrashpadClient client;
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if (argc == 2) {
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if (!client.SetHandlerIPCPipe(argv[1])) {
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LOG(ERROR) << "SetHandler";
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return EXIT_FAILURE;
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}
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} else {
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fprintf(stderr, "Usage: %ls <server_pipe_name>\n", argv[0]);
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return EXIT_FAILURE;
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}
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if (!client.UseHandler()) {
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LOG(ERROR) << "UseHandler";
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return EXIT_FAILURE;
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}
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// Make sure this module has a CrashpadInfo structure.
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crashpad::CrashpadInfo* crashpad_info =
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crashpad::CrashpadInfo::GetCrashpadInfo();
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base::debug::Alias(crashpad_info);
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HANDLE threads[3];
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threads[0] = CreateThread(nullptr, 0, Thread1, nullptr, 0, nullptr);
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threads[1] = CreateThread(nullptr, 0, Thread2, nullptr, 0, nullptr);
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threads[2] = CreateThread(nullptr, 0, Thread3, nullptr, 0, nullptr);
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// Our whole process is going to hang when the loaded DLL hangs in its
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// DllMain(), so we can't signal to our parent that we're "ready". So, use a
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// hokey delay of 1s after we spawn the threads, and hope that we make it to
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// the FreeLibrary call by then.
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Sleep(1000);
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fprintf(stdout, " ");
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fflush(stdout);
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WaitForMultipleObjects(ARRAYSIZE(threads), threads, true, INFINITE);
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return 0;
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}
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